Battle Stadium D.O.N

Gallery:
Successfully complete the game as any character.

Hard difficulty:
Successfully complete Single player mode under the normal difficulty setting.

Very Hard difficulty:
Successfully complete Single player mode under the hard difficulty setting.

Time Attack mode:
Successfully complete Single player mode under the very hard difficulty setting.
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Hint: Unlocking characters::
Gain money by doing missions, then go to the slot machine. Get three of the Shonen Jump signs (a head with a flag behind). You will then be taken to the bonus slot machine mini-game. Get three of the heads that have a "?" on them to unlock a character.
Shadow5561.

The following characters can be unlocked by defeating them in Single player mode, then playing the slot machine until they are won:
Shadow5561.

Buu
Cell
Frieza
Gaara
Majin Buu
Nami
Rock Lee
Trunks
Ussop